Lava Mountains

Coordinates: 35°26′13.862″N 117°31′11.206″W / 35.43718389°N 117.51977944°W

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Lava Mountains
Lava Mountains Location of Lava Mountains in California^[1]
Highest point
Elevation	1,392 m (4,567 ft)
Geography
Country	United States
State	California
District	San Bernardino County
Range coordinates	35°26′13.862″N 117°31′11.206″W / 35.43718389°N 117.51977944°W / 35.43718389; -117.51977944
Topo map	USGS Klinker Mountain

The Lava Mountains are a mountain range located along the northern edge of the Mojave Desert, in San Bernardino County, California.^[1]^[2] They are one of the eastern limits of the Fremont Valley.^{[citation needed]} They span the northwestern portion of the Golden Valley Wilderness, which sits between it and the Almond Mountains on the southeastern side.^[3] The mountain range is cut by several deep-walled canyons with distinctive layers of multicolored sedimentary rocks.^[3] The peak of the mountain range is at around 5,000 feet on Dome Mountain.^[3]

Geology

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The mountains are located along the Garlock Fault.^[4] The Blackwater fault passes through the southwestern part of the area, and the Brown's Ranch fault zone and its associated faults pass through the western part.^[2]

The pre-Tertiary rocks in the area mainly consist of quartz monzonite.^[2] The major sedimentary unit is the Bedrock Spring Formation, which is chiefly composed of arkosic sandstone and conglomerate, as well as some silstone and brecciated volcanic rocks.^[2] That formation is overlain by the Almond Mountain volcanics and the Klinker Mountain volcanics in the eastern and western parts of the region, respectively.^[2] Overlying these are flows of Lava Mountains andesite dating to the late Pliocene, which are finally covered by Quaternary gravels, alluvium, and travertine.^[2] All of the volcanic rocks in the area are plagioclase andesite porphyries.^[2]

References

[edit]

^ ^a ^b "Lava Mountains". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2009-05-04.
^ ^a ^b ^c ^d ^e ^f ^g Smith, George Irving (1956). Geology and Petrology of the Lava Mountains, San Bernardino County, California (phd thesis). California Institute of Technology.
^ ^a ^b ^c "Golden Valley Wilderness". Bureau of Land Management. Retrieved 2024-07-09.
^ Keenan, Deborah L (2000-01-01). "The geology and geochemistry of volcanic rocks in the Lava Mountains, California: Implications for Miocene development of the Garlock Fault". UNLV Retrospective Theses & Dissertations. doi:10.25669/86xt-tu2t.

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